public class Test{
    public static void main(String [] args){
        //String s = "3";
        //Character h = (Character)s;
        
        
        ExpressionTree X = new ExpressionTree(args[0]);
        if(args.length == 1){
            System.out.println(X.preorder());
            System.out.println(X.postorder());
            //System.out.println(X.inorder() + "= " + X.evaluate());
            //System.out.println(X.evaluate());
        }
        }
    }

